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Modification to TRA9 Sludge Test Cell for the Property Discharge Water Treatment Plant <br /> (PDWTP) <br /> Submitted with TR-29 <br /> Background <br /> The Mayflower Sludge Cell was originally constructed in 2013 as a temporary storage facility to test <br /> and observe the physical properties of sludge generated by the Climax Property Discharge Water <br /> Treatment Plant(PDWTP)thickeners.The sludge cell was constructed with a minimum containment <br /> berm elevation of 10,727amsl,which was originally designed to provide storage until the end of 2020. <br /> However, because the treatment plant produced sludge at a lower density than originally expected, the <br /> cell's life has decreased. Because of this decrease in expected density of the sludge, more volume in <br /> the cell has been used than originally projected. The lower density sludge also prevented the stacking <br /> of sludge on the slope of the cell, which was included in the original calculation of cell life. <br /> Purpose <br /> This project will increase the capacity of the Mayflower Sludge Cell by approximately 125,000 cubic <br /> feet and will provide up to seven more years of sludge placement within the cell.The current sludge <br /> cell,without an expansion, contains space for about one more year of sludge storage. Climax intends <br /> to construct a permanent sludge cell to store the material as described in TR-19. However, before this <br /> can be done Climax will require up to a year to design the new sludge cell, a year to bid the project and <br /> prepare the contractor for work,followed by a year of construction. By extending the life of the current <br /> sludge cell via this expansion project, Climax will be able to better prepare and plan for the construction <br /> of the permanent sludge cell. Climax intends to expand the test sludge cell berm this year(2019)and <br /> construct the permanent cell within the next five years. Completion in this five-year timeframe would <br /> allow for overlap in the availability of both sludge cells in case the current cell fills prior to the seven-year <br /> life that is expected from this expansion. <br /> Scope of Project <br /> The project will consist of increasing the minimum elevation of the containment berm around the <br /> perimeter of the Mayflower Sludge Cell by five feet, from 10,727amsl to 10,732amsl.The work will <br /> include the excavating and hauling of soil from the Mayflower Tailing soil stripping area, then placing <br /> and compacting that soil on the north and west ends of the cell,which are currently the lowest points. <br /> The overall footprint of the sludge cell will not be expanded because of this work. See attached drawing <br /> titled Climax Mine Mayflower Sludge Cell, 2019 Berm Raise Project. <br /> Pagel1 <br />